Board Thread:DMC5 Spoilers/@comment-26516813-20190314122820/@comment-6769189-20190315225425

Balrog talks too, it was stated that he transformed into a DA and had plans to transform back one day to fight Dante.

Cerberus' soul was taken and his body exploded/shattered/disintegrated like many other demons we have seen that got killed. He even tells Dante to take his soul. Not really "alive" when there is no body to return to and is a disembodied soul. Thats like saying that a ghost is alive.

Agni and Rudra are not like other Devil Arms. Their true form is the swords, which is why we consider them alive and the weapon isnt separated from the demons.